What's the reason you desire more power?
Is it to break the wheels loose for a "scarier" ride OR to go faster?
You have BFGoodridges for a start, 300hp will break those loose and scare you into the middle of next week. So you can achieve this without spending a cent.
If it is to go faster - then forget the horse power figure figure for now.
Focus your energy on suspension settings and tires (get rid of the BFGoodridges for a start).
This will net you quicker times and allow you to drive faster with more control.
Then once dialed in and you've had some time to get use to your new purchase and how it reacts, you can decide if more HP is worth it to you.
If it is - then GO NUTS, pull the engine and give it to Brent... Rebuild with more cubes, new heads, new intake and cam... and any other go fast bits you like.
This gives you more time to research, and more time to save for said engine rebuild, and avoids band-aid fixes trying to stop gap a problem which may not exist.
This would be my approach
You of course are welcome to choose what you feel is best.
Either way Enjoy!